Panasonic Lumix G 25 mm f/1.7 ASPH.
5. Chromatic and spherical aberration
Chromatic aberration
The Panasonic 1.7/25 doesn’t have any serious problems connected with the longitudinal chromatic aberration. The colouring of out-of-focus images is noticeable but its level remains low. What’s interesting, a change of aperture from f/1.7 to f/2.2 causes few differences when it comes to that aberration.
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Now let’s check how the lens correct the lateral chromatic aberration – the appropriate graph his shown below.
Here you can’t have the slightest reservations. The aberration depends weakly on the aperture value, with a range from 0.04% to 0.05% including the majority of results. That level we consider to be low. It’s worth noticing that in this category the tested Panasonic fares a bit better than the Olympus M.Zuiko Digital 25 mm f/1.8.
| Olympus E-PL1, f/2.8 | Olympus E-PL1, f/16.0 |
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Spherical aberration
It would be difficult to notice any ‘focus shift’ effect in the first photo of this chapter. The circles of light we got in front of and behind the focus do feature some differences but they are not especially pronounced. As a result we think the tested lens doesn’t have any serious problems with the spherical aberration.
| Olympus E-M10, f/1.7, in front of | Olympus E-M10, f/1.7, behind |
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